"In the meantime, as I stood in the dark garden, watching the girl ransack the private papers of her dead host, I felt no fear of her finding what she was looking for. Lord Ashiel had convinced me that he would hide his secret affairs more carefully than that; and, as I expected, the time came when she gave up the search and departed the way she had come. And that way, to my astonishment, was through the grandfather's clock I had spent so much time in examining. No sooner had she gone than I returned to the library, where I soon discovered that the hidden entrance lay through the one part of the clock I had not investigated. A trap in the floor could be opened by turning a small knob, and I found beneath it the top of that flight of stairs which we now know leads out to the door under the battlements. There were fifteen steps in the flight, and my first idea was to examine the eleventh one of them. I was rewarded by the discovery of a concealed drawer, which in its turn disclosed a single sheet of paper. "On it were written some words that I could not at first understand, but of which finally, by good luck, and with your help, Lady Ruth, I was able to decipher the meaning. They referred, in an obscure and veiled fashion, to the great statue erected by Lord Ashiel in that glen of which his wife had been so fond; where the beginning of the track used by the cattle drivers and robbers of old, which is known as the Green Way, leads up over the hills to the south. Guided by Lady Ruth, I found on the pedestal of the statue a spring, which has only to be pressed when a door in one end of the erection swings open, and discloses the hollow chamber in the middle of the pedestal. At the far end of the cavity was the tin box, of which the key lay temptingly on the top. I lost no time in springing towards it, for here I felt sure was all I wanted to find, but as I inserted the key in the lock the door slammed to behind me and I found myself shut in the dark interior of the pedestal. Luckily Lady Ruth was with me, and quickly let me out. I found that the door was controlled by an elaborate piece of clockwork, which is set in motion by the pressure upon the floor of the feet of any intruder, causing the door to shut almost immediately behind him. But for you, Lady Ruth, I should be there now. But the incident gave me an idea.